The OptiX OSN 3500 forms three independent rings: north ring, southeast ring, and southwest ring. The fiber connection is unavailable between the three rings. Three sets of equipment on the three rings are respectively connected to the hub through a network cable. The hub is connected to the NM computer. Check the ECC routing. Log in to an NE on the north ring and query the ECC routing. It is found that the ECC can be connected to the equipment on the other two rings. The fiber connection, however, is unavailable between the three rings. Log in to an NE on the southeast and southwest rings respectively, and find the same fault exists. The extended ECC is disabled at the gateway NEs on the three rings. Normally, the NEs on the three rings cannot log in to each other in this case.
1、Check whether the fibers are correctly connected. Remove the network from the gateway NE on the southwest ring to the hub. Log in to an NE on the north ring and check the ECC routing. It is found that the NE fails to connect to the NEs on the southwest ring. Then, remove the network from the gateway NE on the southeast ring to the hub. At this time, only the gateway NE on the north ring is connected to the NMS at the hub. Log in to an NE on the north ring, check the ECC routing. It is found that this NE fails to connect to the NEs on the southwest and southeast rings. It indicates that the fiber connection is correct.
2、Check the status of the OSI protocol of the gateway NEs. The OptiX OSN equipment supports the OSI communication protocol. Hence, the OSI protocol is enabled at the network port by default. That is, when the equipment is interconnected through a hub, the corresponding routes are automatically created. Disable the OSI protocol of the gateway NE and then the ECC communication between the subnetworks becomes unavailable. All the NEs can log in to NEs on the same ring only.
The problem may exist with the fiber connection or the communication protocol of the gateway NE.
See also case in chinese:SC0000162500